Instruction Manual
D104707X012
WhisperTube
August 2021
5
Maintenance
WARNING
Avoid personal injury or damage to property from sudden release of pressure or uncontrolled process fluid. Before starting
disassembly:
D
Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
D
Use bypass valves or completely shut off the process to isolate the WhisperTube from process pressure.
D
Remove process pressure and drain the WhisperTube if necessary.
D
Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Disassembly
1. Isolate the WhisperTube from the process pressure, relieve all process pressure, and drain any internal liquid
buildup if necessary.
2. Remove the WhisperTube from the pipeline.
Follow steps 3-5 for a single piece body construction (NPS 2-6)
3. Remove the screen retainer (key 8) by loosening the two retainer screws (key 11).
4. Remove the wave spring (key 4) and perforated screen tube (key 2).
5. Inspect the perforated screen tube, wave spring, and internal surfaces of the WhisperTube body (key 1) and replace
damaged components as necessary. Visually inspect the flange serrated surfaces for any damage that may prevent
proper sealing.
Follow steps 6-9 for the two-piece body construction (NPS 8-12)
6. Set the WhisperTube in a vertical position with one flange resting on a clean soft surface. Use caution to protect the
flange serrated surfaces.
Separate the two body halves by removing the body flange studs and nuts (keys 13 and
14).
7. Remove the spiral wound gasket (key 12) and perforated screen tube (key 3).
8. The wave spring (key 4) may be accessed and removed from the inlet flange end of the WhisperTube body.
9. Inspect the perforated screen tube, wave spring, and internal surfaces of the WhisperTube body (key 1) and replace
damaged components as necessary. Visually inspect the flange serrated surfaces for any damage that may prevent
proper sealing.
Assembly
Follow steps 10-13 for a single piece body construction (NPS 2-6)
10. Ensure the old flat sheet gasket (Key 9) is removed.
11. Re-insert the perforated screen tube into the body bore until the end of the tube seats against an internal ledge in
the body at the outlet flange end.
12. Re-install the wave spring.
13. Center a new flat sheet gasket (key 9) on the screen retainer sealing surface and install on the body. Secure the
retainer with washers (key 10) and retainer screws (key 11).
